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Consider these reactions, where M represents a generic metal. 1. AH, = -570.0 kJ 2. AH = -74.8 kJ 2 M(s) + 6 HCl(aq) + 2 MC1,
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Answer #1

Lets number the reaction as 1, 2, 3, 4, 5 from top to bottom
required reaction should be written in terms of other reaction
This is Hess Law
required reaction can be written as:
reaction 5 = +1 * (reaction 1) +6 * (reaction 2) +3 * (reaction 3) -2 * (reaction 4)

So, ΔHo rxn for required reaction will be:
ΔHo rxn = +1 * ΔHo rxn(reaction 1) +6 * ΔHo rxn(reaction 2) +3 * ΔHo rxn(reaction 3) -2 * ΔHo rxn(reaction 4)
= +1 * (-570.0) +6 * (-74.8) +3 * (-1845.0) -2 * (-365.0)
= -5823.8 KJ
Answer: -5823.8 KJ

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